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// Copyright 2019 Nick White.
// Use of this source code is governed by the GPLv3
// license that can be found in the LICENSE file.
// pdfbook creates a searchable PDF from a directory of hOCR and
// image files.
package main
import (
"bufio"
"errors"
"flag"
"fmt"
"log"
"os"
"path"
"path/filepath"
"sort"
"strings"
"rescribe.xyz/bookpipeline"
)
const usage = `Usage: pdfbook [-c] [-s] dir out.pdf
Creates a searchable PDF from a directory of hOCR and image files.
If a 'best' file exists in the directory, each hOCR listed in it is
used to provide the searchable text for each page. Otherwise pdfbook
just looks for a .hocr with the same file base as the image for the
searchable text.
`
type Pdfer interface {
Setup() error
AddPage(imgpath, hocrpath string, smaller bool) error
Save(path string) error
}
const pageWidth = 5 // pageWidth in inches
// pxToPt converts a pixel value into a pt value (72 pts per inch)
// This uses pageWidth to determine the appropriate value
func pxToPt(i int) float64 {
return float64(i) / pageWidth
}
// imgPath returns an appropriate path for the image that
// corresponds with the hocrpath
func imgPath(hocrpath string, colour bool) string {
d := path.Dir(hocrpath)
name := path.Base(hocrpath)
nosuffix := strings.TrimSuffix(name, ".hocr")
imgname := ""
if colour {
p := strings.SplitN(name, "_bin", 2)
if len(p) > 1 {
imgname = p[0] + ".jpg"
} else {
imgname = nosuffix + ".jpg"
}
} else {
imgname = nosuffix + ".png"
}
return path.Join(d, imgname)
}
// addBest adds the pages in dir/best to a PDF
func addBest(dir string, pdf Pdfer, colour, smaller bool) error {
f, err := os.Open(path.Join(dir, "best"))
if err != nil {
log.Fatalln("Failed to open best file", err)
}
defer f.Close()
s := bufio.NewScanner(f)
var files []string
for s.Scan() {
fn := s.Text()
if path.Ext(fn) != ".hocr" {
continue
}
files = append(files, fn)
}
sort.Strings(files)
for _, f := range files {
hocrpath := path.Join(dir, f)
img := imgPath(hocrpath, colour)
err := pdf.AddPage(img, hocrpath, smaller)
if err != nil {
return errors.New(fmt.Sprintf("Failed to add page %s: %v", f, err))
}
}
return nil
}
// walker walks each hocr file in a directory and adds a page to
// the pdf for each one.
func walker(pdf Pdfer, colour, smaller bool) filepath.WalkFunc {
return func(fpath string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() {
return nil
}
if path.Ext(fpath) != ".hocr" {
return nil
}
return pdf.AddPage(imgPath(fpath, colour), fpath, smaller)
}
}
func main() {
colour := flag.Bool("c", false, "colour")
smaller := flag.Bool("s", false, "smaller")
flag.Usage = func() {
fmt.Fprintln(flag.CommandLine.Output(), usage)
flag.PrintDefaults()
}
flag.Parse()
if flag.NArg() != 2 {
flag.Usage()
return
}
pdf := new(bookpipeline.Fpdf)
err := pdf.Setup()
if err != nil {
log.Fatalln("Failed to set up PDF", err)
}
_, err = os.Stat(path.Join(flag.Arg(0), "best"))
if err != nil && !os.IsNotExist(err) {
log.Fatalln("Failed to stat best", err)
}
if os.IsNotExist(err) {
err = filepath.Walk(flag.Arg(0), walker(pdf, *colour, *smaller))
if err != nil {
log.Fatalln("Failed to walk", flag.Arg(0), err)
}
} else {
err = addBest(flag.Arg(0), pdf, *colour, *smaller)
if err != nil {
log.Fatalln("Failed to add best pages", err)
}
}
err = pdf.Save(flag.Arg(1))
if err != nil {
log.Fatalln("Failed to save", flag.Arg(1), err)
}
}
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